Direct observation of electron relaxation in intrinsic GaAs using femtosecond pump-probe spectroscopy

1995 ◽  
Vol 52 (7) ◽  
pp. 4654-4657 ◽  
Author(s):  
A. Alexandrou ◽  
V. Berger ◽  
D. Hulin
Keyword(s):  
Direct Observation ◽  
Pump Probe ◽  
Electron Relaxation ◽  
Probe Spectroscopy

Singlet fission in rubrene single crystal: direct observation by femtosecond pump–probe spectroscopy

2012 ◽  
Vol 14 (23) ◽  
pp. 8307 ◽  
Author(s):  
Lin Ma ◽  
Keke Zhang ◽  
Christian Kloc ◽  
Handong Sun ◽  
Maria E. Michel-Beyerle ◽  
...  
Keyword(s):  
Single Crystal ◽  
Direct Observation ◽  
Singlet Fission ◽  
Pump Probe ◽  
Probe Spectroscopy

scholarly journals TWO-TEMPERATURE MODEL OF NONEQUILIBRIUM ELECTRON RELAXATION: A REVIEW

2010 ◽  
Vol 24 (09) ◽  
pp. 1141-1158 ◽  
Author(s):  
NAVINDER SINGH
Keyword(s):  
Electronic Relaxation ◽  
Temperature Model ◽  
Open Problems ◽  
Nonequilibrium Electron ◽  
Pump Probe ◽  
Nano Scale ◽  
Electron Relaxation ◽  
Probe Spectroscopy ◽  
Kinetics Of ◽  
Two Temperature

The present paper is a review of the phenomena related to nonequilibrium electron relaxation in bulk and nano-scale metallic samples. The workable Two-Temperature Model (TTM) based on Boltzmann–Bloch–Peierls kinetic equation has been applied to study the ultra-fast (femto-second) electronic relaxation in various metallic systems. The advent of new ultra-fast (femto-second) laser technology and pump-probe spectroscopy has produced wealth of new results for micro- and nano-scale electronic technology. The aim of this paper is to clarify the TTM, conditions of its validity and nonvalidity, its modifications for nano-systems, to sum-up the progress, and to point out open problems in this field. We also give a phenomenological integro-differential equation for the kinetics of nondegenerate electrons that goes beyond the TTM.

scholarly journals Hot electron relaxation in the heavy-fermionYb1−xLuxAl3compound using femtosecond optical pump-probe spectroscopy

2009 ◽  
Vol 80 (8) ◽  
Author(s):  
J. Demsar ◽  
V. V. Kabanov ◽  
A. S. Alexandrov ◽  
H. J. Lee ◽  
E. D. Bauer ◽  
...  
Keyword(s):  
Hot Electron ◽  
Optical Pump ◽  
Pump Probe ◽  
Electron Relaxation ◽  
Probe Spectroscopy

scholarly journals Ultrafast Electron/Energy Transfer and Intersystem Crossing Mechanisms in BODIPY-Porphyrin Compounds

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 312
Author(s):  
Yusuf Tutel ◽  
Gökhan Sevinç ◽  
Betül Küçüköz ◽  
Elif Akhuseyin Yildiz ◽  
Ahmet Karatay ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Energy Transfer Mechanism ◽  
Free Base ◽  
Pump Probe ◽  
Harvesting Efficiency ◽  
Probe Spectroscopy ◽  
Absorption Features ◽  
Transfer Mechanisms

Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.

Classical theory of ultrafast pump-probe spectroscopy: Applications to I2 photodissociation in Ar solution

1994 ◽  
Vol 61 (1-3) ◽  
pp. 153-165 ◽  
Author(s):  
Robert M. Whitnell ◽  
Kent R. Wilson ◽  
YiJing Yan ◽  
Ahmed H. Zewail
Keyword(s):  
Classical Theory ◽  
Pump Probe ◽  
Probe Spectroscopy

Coherent pump–probe spectroscopy of a Λ system with a close lying excited level

2013 ◽  
Vol 88 (6) ◽  
pp. 065404 ◽  
Author(s):  
Niharika Singh ◽  
Ayan Ray ◽  
R D'Souza ◽  
Q V Lawande ◽  
B N Jagatap
Keyword(s):  
Excited Level ◽  
Pump Probe ◽  
Probe Spectroscopy

Ultrafast pump-probe spectroscopy of native etiolated oat phytochrome

Biochemistry ◽  
1993 ◽  
Vol 32 (29) ◽  
pp. 7512-7518 ◽  
Author(s):  
Sergei Savikhin ◽  
Todd Wells ◽  
Pill Soon Song ◽  
Walter S. Struve
Keyword(s):  
Pump Probe ◽  
Probe Spectroscopy

Ultrafast pump-probe spectroscopy: femtosecond dynamics in Liouville space

1989 ◽  
Vol 93 (25) ◽  
pp. 8149-8162 ◽  
Author(s):  
Yi Jing Yan ◽  
Laurence E. Fried ◽  
Shaul Mukamel
Keyword(s):  
Pump Probe ◽  
Liouville Space ◽  
Femtosecond Dynamics ◽  
Probe Spectroscopy

Investigation of Local Dynamics on the Sub-micron Scale in Organic Blends Using an Ultrafast Confocal Microscope

2010 ◽  
Vol 1270 ◽  
Author(s):  
Giulia Grancini ◽  
Dario Polli ◽  
Jenny Clark ◽  
Tersilla Virgili ◽  
Giulio Cerullo ◽  
...  
Keyword(s):  
Excited State ◽  
Confocal Microscopy ◽  
Polymer Blends ◽  
Spatial Resolution ◽  
Temporal Resolution ◽  
Electronic States ◽  
Pump Probe ◽  
Peculiar Behaviour ◽  
Spatio Temporal ◽  
Probe Spectroscopy

AbstractWe introduce a novel instrument combining femtosecond pump-probe spectroscopy and confocal microscopy for spatio-temporal imaging of excited-state dynamics of phase-separated polymer blends. Phenomena occurring at interfaces between different materials are crucial for optimizing the device performances, but are poorly understood due to the variety of possible electronic states and processes involved and to their complicated dynamics. Our instrument (with 200-fs temporal resolution and 300-nm spatial resolution) provides new insights into the properties of polymer blends, revealing spatially variable photo-relaxation paths and dynamics and highlighting a peculiar behaviour at the interface between the phase-separated domains.

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